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Description
4"x21" | 800 GPD | 99.6% Salt Rejection | Watermaker Seawater RO Membrane | Applied MembranesAMI 4x21 Seawater Desalination Reverse Osmosis Membranes For Watermakers and Land and Sea Based Seawater Desalinators Highest Salt Rejection Seawater RO Watermaker Membranes AMI high rejection and high productivity seawater reverse osmosis membranes are specially designed for marine applications. AMI SWRO membranes are ideal for seawater desalination in shipboard applications, watermakers, land based desalinators and sea based desalinators. AMI
AMI 4x21 Seawater Desalination Reverse Osmosis Membranes
For Watermakers and Land-and-Sea Based Seawater Desalinators
Highest Salt Rejection Seawater RO Watermaker MembranesAMI high rejection and high productivity seawater reverse osmosis membranes are specially designed for marine applications. AMI SWRO membranes are ideal for seawater desalination in shipboard applications, watermakers, land-based desalinators and sea-based desalinators. AMI Membranes are 100% Quality and Performance Tested in their ISO 9001:2015 Certified Facilities. Looking for a replacement seawater desalination membrane element for your watermaker filter system? View our Watermaker Replacement Membrane Chart. Benefits of AMI Seawater Desalination RO Membranes:
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M-S4021A Specifications
Permeate flow and salt rejection based on 32,000 ppm NaCl feed stream, pressure and recovery listed above. Element Permeate flow may vary +/- 20% M-S4021A Operating Limits
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Related Products for use with M-S4021A Seawater Elements
| C-C2510-A11 | Membrane Cleaning Cartridge with Acid Cleaner to Remove Scale Buildup and Prolong Membrane Life |
| C-C2510-A22 | Membrane Cleaning Cartridge with Alkaline Cleaner to Remove Organics and Prolong Membrane Life |
| C-C2510-A88 | Membrane Preservative Cartridge for Preserving the System and Membrane During Extended Periods of Non-Operation. |
| 655139-03 | Oil Absorbing Filter Cartridge - Oil-Water Separator Replacement Cartridge, 20" Big Blue Pentair Pentek Filter |
| H-F10100CF | Plankton Filter - 10" Standard 100 Micron Spun Polypropylene Replacement Filter Cartridge |
Common Applications for AMI Seawater Watermaker Elements:
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Physical Dimensions of AMI M-S4021A SWRO Marine Element
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Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.4 ★★★★★
Based on 19 reviews
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Product Reviews
★★★★★ 5
FANTASTIC!!
Our dog Tigger has LOTS of energy. 😅 Even with my husband taking him to run alongside his bike around the block three times the other day, Tigger wasn’t even panting by the end. 🤣 I was talking to a new friend who mentioned more mental stimulation could help. Last Tuesday evening, he learned “give paw” within about 15 minutes. Hmm he’s a SMART pup. 🤔 Bonus…teaching him that seemed to really tire him out.
From that point, I looked up dog mental stimulation toys here on Amazon and bought three puzzle feeders—this one is one of them. They’ve been amazing!! Tigger has been slowly catching onto how to get the food, which stops him from eating so dang fast AND also exercises his canine brain.
⭐️⭐️⭐️⭐️⭐️ I HIGHLY recommend something like this if you have dogs that have boundless energy or just seem like no amount of exercising helps calm them down.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 20, 2023
★★★★★ 4
Works well!
Fun for dogs! Only silly thing is it moves around on the floor a little bit, but overall works good! My lab loves it
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 10, 2025
★★★★★ 5
Great for busy pups and smart dogs!
This keeps my puppy blue heeler busy and happy. Easy to fill and wash. I put her puppy food in it and put it in her crate to play with. The kibble fits perfectly in each little hiding place. After a month of fun it has not broken or malfunctioned.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 31, 2025
★★★★★ 5
Great treat
Gave this to my friend’s dog, and they took a video when they put it down! The dog immediately found one of the treats and kept looking for the other treat and eventually found it this dog loved it!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 17, 2026
★★★★★ 3
Easy, fun puzzle
My dog really enjoys this puzzle. It is a pretty easy puzzle for her. The only issue is that the tiles on one side does not slide easily like the other side. The first one I received was so hard to move, that I returned it for a replacement. The second one is better but still has the same issue. Other than that, it is made well. The size of the puzzle works well for my 5 lb dog.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 30, 2025
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